Re: Lets talk about spark plugs heat range.
From what I know and use, the insulator above the electrode should be light tan or ash colored if the A/F is right and the heat range is correct. If the electrode is clean, I would think that was a good sign.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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